How the due date is worked out
The due date is about 280 days (40 weeks) after the first day of your last period, adjusted for your cycle length. Only about 1 in 20 babies arrive on the exact day — anywhere from 37 to 42 weeks is normal. Your doctor confirms the date with the first ultrasound.
Information only, not a diagnosis. Always follow your doctor's advice. In an emergency call 112.
Based on guidance from the Ministry of Health & Family Welfare, National Health Mission and WHO. Last updated 2026-11-11 · Doctor review: in progress
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